PropertyChanged event always null

Question

I have the following (abbreviated) xaml:

<TextBlock Text="{Binding Path=statusMsg, UpdateSourceTrigger=PropertyChanged}"/> 

I have a singleton class:

public class StatusMessage : INotifyPropertyChanged {        private static StatusMessage instance = new StatusMessage();      private StatusMessage() { }      public static StatusMessage GetInstance()     {         return instance;     }      public event PropertyChangedEventHandler PropertyChanged;     private void OnPropertyChanged(string status)     {         if (PropertyChanged != null)         {             PropertyChanged(this, new PropertyChangedEventArgs(status));         }     }      private string statusMessage;     public string statusMsg     {         get         {             return statusMessage;         }         set         {             statusMessage = value;             OnPropertyChanged("statusMsg");         }     } } 

And in my main window constructor:

StatusMessage testMessage = StatusMessage.GetInstance(); testMessage.statusMsg = "This is a test msg";     

I cannot get the textblock to display the test message. When I monitor the code through debug, the PropertyChanged is always null. Any ideas?

Answer 1

Thanks Jerome! Once I set the DataContext it started working as it should! I added the following to the main window constructor for testing purposes:

 this.DataContext = testMessage;